Final answer:
Water is critical for life because it is used for cellular energy and is an excellent solvent in cells.
Step-by-step explanation:
Water is critical for life for two main reasons:
- It is the molecule used for cellular energy: Water participates in various biochemical reactions, such as photosynthesis and cellular respiration, which generate ATP, the energy currency of cells.
- It is excellent at dissolving things in cells: Water's polarity and ability to form hydrogen bonds make it an ideal solvent for many substances in cells, allowing for chemical reactions and transport of molecules.
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